linux-kernel - [PATCH] scsi: ufs: Fix incorrect ufshcd_state after ufshcd_reset_and

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Message-Id: <20210301191940.15247-1-adrian.hunter@intel.com>
Date:   Mon,  1 Mar 2021 21:19:40 +0200
From:   Adrian Hunter <adrian.hunter@...el.com>
To:     "Martin K . Petersen" <martin.petersen@...cle.com>,
        "James E . J . Bottomley" <jejb@...ux.ibm.com>
Cc:     linux-scsi@...r.kernel.org, linux-kernel@...r.kernel.org,
        Alim Akhtar <alim.akhtar@...sung.com>,
        Avri Altman <avri.altman@....com>,
        Bean Huo <huobean@...il.com>, Can Guo <cang@...eaurora.org>,
        Asutosh Das <asutoshd@...eaurora.org>,
        Stanley Chu <stanley.chu@...iatek.com>
Subject: [PATCH] scsi: ufs: Fix incorrect ufshcd_state after ufshcd_reset_and_restore()

If ufshcd_probe_hba() fails it sets ufshcd_state to UFSHCD_STATE_ERROR,
however, if it is called again, as it is within a loop in
ufshcd_reset_and_restore(), and succeeds, then it will not set the state
back to UFSHCD_STATE_OPERATIONAL unless the state was
UFSHCD_STATE_RESET.

That can result in the state being UFSHCD_STATE_ERROR even though
ufshcd_reset_and_restore() is successful and returns zero.

Fix by initializing the state to UFSHCD_STATE_RESET in the start of each
loop in ufshcd_reset_and_restore().  If there is an error,
ufshcd_reset_and_restore() will change the state to UFSHCD_STATE_ERROR,
otherwise ufshcd_probe_hba() will have set the state appropriately.

Fixes: 4db7a2360597 ("scsi: ufs: Fix concurrency of error handler and other error recovery paths")
Signed-off-by: Adrian Hunter <adrian.hunter@...el.com>
---
 drivers/scsi/ufs/ufshcd.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/scsi/ufs/ufshcd.c b/drivers/scsi/ufs/ufshcd.c
index 77161750c9fb..91a403afe038 100644
--- a/drivers/scsi/ufs/ufshcd.c
+++ b/drivers/scsi/ufs/ufshcd.c
@@ -7031,6 +7031,8 @@ static int ufshcd_reset_and_restore(struct ufs_hba *hba)
 	spin_unlock_irqrestore(hba->host->host_lock, flags);

 	do {
+		hba->ufshcd_state = UFSHCD_STATE_RESET;
+
 		/* Reset the attached device */
 		ufshcd_device_reset(hba);

-- 
2.17.1